while (1) 
{
my @chars = ( "A" .. "Z", "a" .. "z", 0 .. 9, qw(! @ $ % ^ & *) );
if ($usedpw ne m/$pw/);
{
print "Your unique password is: $pw\n";
}
}
[download]

Well, there are a few problems.

• Work on your indentation. Two braces one on top of the other is a big obstacle to readability.
• Why do you have a ';' after the condition in your if statement? Normally an if statement is of the form

  if ( $foo == 1 )
  {
    $bar++;
  }
  [download]

  There's no semi-colon.
• Use 'ne' when comparing strings, '!=' when comparing numeric values and =~ when comparing patterns.
• Get rid of the 'm' in front of the pattern. It's not needed.
• How do you expect to get out of this endless loop if you aren't changing the thing that you're testing?
• Why aren't you using the array that you've defined inside the loop?
• The array definition doesn't change inside the loop (we call that loop-invariant) -- so you can take it outside the loop.
• How about some comments in the code, explaining what you're trying to do. Is it something to do with generating a password? What are the inputs and outputs?